Installation and insulation of jumpers from homemade U-blocks made of aerated concrete [many photos]

One of the most time-consuming steps in building a house box is installing and pouring lintels over windows and openings. Many people pour them into plank formwork. I decided to do it differently: pour the jumpers into homemade U-blocks.

IN previous articleI showed you how I glued these U-blocks (fixed aerated concrete formwork). There is no need to cut solid blocks of 400 mm and discard their inner part. There is no waste when gluing the blocks. Consumable part - only glue-foam:

For 10 rows of masonry, 15 cylinders were used. This is only when filling vertical slots. And gluing the U-blocks further increased the consumption.

In the beginning, under the U-blocks, I put up supports from old boards, which have remained since 2017. from the formwork when pouring the concrete tape of the fence. Fixed on long 72 mm self-tapping screws. The main thing is not to twist them in aerated concrete when twisting them. Better not to tighten them up a bit.

For reliability, I installed supports in the window openings. Because boards 25 mm, then I made two boards.

Construction site as of June 28, 2020

The process of installing U-blocks in window openings and lintels. Connected to glue-foam. If there were gaps due to the imperfection of gluing the blocks, he foamed them. Everything must be airtight, the concrete must not flow out.

Jumper type. They do not differ from ordinary masonry blocks. You can't even say that they will be concrete inside.

Here I decided to combine the jumpers. Fewer undercutting of blocks, small savings, and the design is more reliable.

Type of masonry with jumpers. Lintels do not need to be separately insulated from the outside, as many do before insulating the facade of the house. Insulation layer in the external lintels inside:

The process of installing XPS insulation. In the first photo - from the remains of Termite sheets, and in other photos - from Penoplex. Manufacturers highlight their products with color.

The process of gluing the insulation onto the foam adhesive. This is necessary so that it does not float up during the pouring of concrete and so that the concrete does not flow under it and into the cracks, forming cold bridges.

Then I sanded the upper edges of the blocks and insulation with a grater, which I use to grind aerated concrete (from coarse sandpaper) and blew out all the dust from the formwork with a hairdryer. It seemed like a little work, but it took a week, working in the evenings.

It was possible to purchase factory aerated concrete lintels. But I won't pick them up alone, I need an assistant. Perhaps, on the second floor, I will consider this option as the least laborious and fast.

Continued: reinforcement and pouring of lintels with concrete - see the next article ...

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Photos of the author (c)

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